Dust guard



Dec. 22, 1931. w. N. THORNBURGH DUST GUARD 1927 4 Sheets-Sheet Filed Oct. 26

A TTORNEYJ Dec. 1931- w N. THORNBURGH 1,837,379

. DUST GUARD Filed Oct. 26, 192'? 4 Sheets-Sheet 2 INVENTOR. WMTlwmburyk BY ){W A TTORNEYIS' Dec. 22, 1931.4

W. N. THORNBURGH DUST GUARD 4 Sheets-Sheet 3 Filed Oct. 26, 1927 mm W. U

I; INVENTOR.

WET/zomburgfi A TTORNEYS DUS T GUARD Filed Oct. 26, 192'? 4 Sheets-Sheet 4 A TTORNEYJ Patented Dec. 22, 1931 e N4 eme m te r m me Assam o w. a. mamas MANUrAor Rmdco; OF crease; trimmers; A cosrona'rrolv or ,irLLmoIs Dash-GUARD Application filed oetober'ee, 1927; "Serial 'nofi'eesssozconsists of a singleelayer-"sheeis metal plate having an integral gasketchannel-flange drawn-on theperiplrery of the aXleapertu're.

I am aware that dust guards have been HlElClGdlGIGtOfOFB of wood 0r castnietal, or two layerscf sheetmeta-l -wlth a gasket channel in 'the-fiportion surrounding the axle.

However each of the above types of guards guardhas a tendency to split in use. The cast metal gua-rd requires "more.v metal than a sheet metal": guard to provide the necessary strengthandis therefore heavier and the cost is prohibitive.

from each sheet to form the axle aperture which is wasted and cannot even be sold as scrap? The invention isapplicableto either. single piece dust guards or so called compensating dust'guards consisting of two relatively slidables-(actions pressed against .-.the' axle by means-0t springs.

Another feature of theiinvention is a small spacer which holds the gasketexpanded to facilitate-assemblyon the axle andwhich thin-enoughto wear out qui-c'lily and allow the gasket to close {around-the axle? The invention will be described-in. detail;

in connection with certain illustrative embodiments thereof: shown in the" accoinp anying drawings in which i U 1 Figi i is alongitudi-nal section of'abearing:

i dust guard,=- v

F ig.4a is an elevational view-of a stamped-- blank ready to be drawn;

Fig. 5is a central section of the blank,

Fig. 6 is a central section-of the-blank afterthe first drawing operation,

; in sectioiroi stillanot-her V l f embodying "my invention: The two layer sheet; metal a guard requires twice-the metal .used in my 20 single layerguardaand this item is particu larly lIHPOItZLILUbQCL-USQ of the large disk cut the second drawing operation,

Fig. 7 is a central section of the blank after Fig. 8 is an axial section of the die used for the tirst'd'rawing operation, 7 v

Fig. 9 is a planview of the die used'for the "second-drawing operation,

, Fig. 10 isan axial section of the die'used 1 i for the second drawing operation,

a modified form of dustgnard Fig. 1-3 isa detail perspective view of a per Fig. 11 is an elevation partlyin sectionof Fig. 12: is an elevation of a compensating 1-1 -dustguardembodymg my invention, has -certa1n disadvantages. The wooden 1 tion of the guard shown in Fig. 12, and I Fig. 14; is aifraginentary elevation partly The bearing box-1, in which is .the a-Xle 2, is provided-withthe eustomarydustguardqslotfi' in which the du'stguafrd 4' is -held.- The dust-guardis made-of a sing-1e fO lnof dustguard journaled sheet-50f metalin the-centerof which is cut a circular-aperture 5. "The -1net-al around" theperiphery of the aperture is d'rawnitoi form a gasketchannel-flange-6 in which is "around the circumference of the aperture=5 and lyingparallel'=totheflplate 9, a bottom-w wall "10 projecting outward from the side wall 8, ancl-a retaining ,lip ll on theou'ter edge of bottomwall-lO.

The plate9isprovidedwithlatera-l flanges 12, and-top'and bottom flanges 18 and' l ip The flangesl3 and 14 are of such width that they-fit snugly in the slot '3 but; permit free vertical movement of the dust guardso that it can 'ride'on'theaxle 2' with its gasket 7;

, The flange- 13, which extends substantially slot/Bio the outer sideof the: dust guardfi 90 all the way alongt-he. top-of slot-.3.serves"- "to shedrdirt falling-"into the uppenend of WVhile the init'erior-grade-of sheet-metall used fjfordust-guards" is not-particularly adapted iorbeing drawnfthe channel fiange manner?" can-be-successfully made in the-following 1 die shown in Fig. 8 and drawn into the form shown in Fig. 6. A central block 21 of die 26 presses out the metal which is to form the gasket groove 6. The outer lip 11 is bent down in the ti'st operation by a plate Outside of block 21 are arranged two rings 23 and 2 1 provided with cooperating shoulder and recess 25 and 26, whose function it is to form a mold 27, which, when straightened into alinement with the plate, will form the inner side of the gasket channel. After the first drawing operation the blank has the form shown in Fig. 6.

The next drawing operation is performed by the die 28 illustrated in Figs. 9 and 10. This die has a Hat ring 29 which straightens the told 27 into alinement with the body of the plate, and a series of radially movable segments 30 which expand the channel-flange into its final form. The segments 30 are moved outward by a wedge 31 and inward by springs 32. The partially completed guard when removed from the die 28 has the form shown in Fig. 7.

The side flanges 12 and top and bottom flanges are next turned up in a manner well known and the guard is ready to have the gasket inserted and clinched in place by bumping the sides of the groove against it.

In tlie finished dust guard the channel flange and the body of the guard are formed of the same continuous sheet of metal, by which I mean that the channel flange is formed by distortion of the sheet of metal of which the body of the guard is made, not by welding together separate pieces of sheet metal. The channel flange and its connection to the body of the guard therefore have the inherent strength of the original sheet metal and do not depend upon the degree of care with which a welding has been donean important consideration in articles produced at a high rate of speed.

In Figs. 11 to 14 are shown three modified forms of dust guard. In the guard shown in Fig. 11 the metal portion is the same as that of the first form except that the channelflange 6a is preferably a little deeper. A split gasket 7a is arranged in the groove 6a and is not clinched, but is free to move radially. Behind the gasket is a corrugated spring which engages the base of the channel on one side and the gasket on the other and holds the gasket in close contact with the axle around its entire circumference, at the same time keeping the gasket concentric in the channel. To facilitate the insertion of the axle through the gasket a thin spacer 41 is inserted between the ends of the gasketto hold it expanded to the size of the portion or the axle upon which it is to ride. The

spacer is made very thin so that it soon wears through and permits the gasket to be con tracted upon the axle by spring 10. The corrugated sprmg and spacer can obviously be which can be used in connection with the outstanding channel-flange. In the channelflange 6?) there is an opening 50. The ends of the split gasket 7 Z) are provided with hooks 51, and a tension spring 52 connecting these two hooks contracts the gasket around the car axle. A spacer can also be used with this modification to facilitate the insertion of the car axle.

The guard shown in Figs. 12 and 13 is of the same general form as the first described guard, but is cut along lines tangent to the aperture 61 to form a section 62 slidable with relation to the other section 63. The two sections are connected together by interlocking guide members 64 which hold the sections in alinement but permit relative longitudinal movement. The guides 64 shown in the drawin are substantially the same as those shown in the l/Villiams Patent No. 1,353,881 and I do not claim their particular form as my invention. They consist of telescoping tubes 65 and 66 having outwardly projecting flanges 67 and 68, the flange 68 extending through a slot 69 in tube 65. The flanges 67 and 68 are welded to brackets 70 which in turn are welded to the sections 62 and 63. The tube 65 has a tongue 71 at one end and the tube 66 has a similar tongue (not shown) at the opposite end. A spring 72 stretched between the two tongues draws the tubes together and thereby pulls section 62 toward the center of the aperture 61.

The gasket channel-flange 60 holds a gasket 7 0 which is diagonally split at two points 7 3 adjacent the points of tangency of the division lines 60. The gasket 70 is made of flexible or semiflexible material so that as it is worn and its ends slide relative to one another they will adapt themselves to the axle and maintain a tight joint.

Having described my invention, I claim:

1. A dust guard consisting of a plate formed of a single layer of sheet metal apertured to receive a car axle, the metal adjacent said aperture being bent into the form of a channel-flange surrounding said aperture, said channel-flange consisting of a side wall joined to said plate at the circumference of said aperture and lying parallel to said plate, a bottom wall projecting outward from said side wall, and a retaining lip on the outer edge of said bottom wall.

2. In a dust guard comprising a plate apertured to receive an axle, a gasket channel around the periphery of said aperture, a split gasket in said channel, resilient means for radially contracting said gasket and a spacer of thin material inserted between the ends of said gasket for temporarily holding the same expanded to facilitate assembling the guard on the axle.

3. A dust guard comprising a plate apertured to receive a car axle and an inwardly opening substantially U-shaped channel flange surrounding said aperture, said plate and channel being formed of a single continuous sheet of sheet metal.

WVILLIAM N. THORNBURGH. 

